Exhaust-air conduit for driers



lFel. 24. 1925. 1,527,952 F, L. FURBUSH ET AL EXHAUST AIR coNDuIT FonDRI'ERS Filedreb. 25, 1924 :s Sheng-sheet 1 Y ey:

, Feb. 24. 1925.

F', L. FURBUSH ET AL EXHAUST AIR CONDUIT FOR DRIERS Filed Feb. 25, 19243 Sheets-Sheet 2 QMS ` I vzzvcZO-ns'. HL, wzmslz f1.6'. 56113877177 Y q4Il arnenzfs y Feb, 24. l'925.

. F. L. FURBUSH ET AL EXHAUST AIR CONDUIT FOR DRIERS' 3 Shevets-Sheet 3Filed Feb. 25, 1924 JI. Jar-3872? @Mrt-raggi@ il Il Patented Feb. 24,179725.

UNITED STATES PATENT oF-Flcs.

FRANK L. FURBUSH AND ALLAN' C. SARGENT, 0F WESTFORD, lVIASSACT-IUSETTS,AS- SIGNORS TO C. G. SARGENTS SONS CORPORATION, OF GRANTEVILLE,MASSACHU- SETTS, A CORPORATION MASSACHUSETTS.

EXHAUST-AIR `CONIDUT FOR DRIERS.

Application filed February 25, 1924. vSerial N'o. 694,997.

To all whom t may concern.' j

Be it known that we, F RANK L. FURBUsn and ALLAN C. SARGnNnboth citizensof the United States, both residing at Westford, in the county ofMiddlesex and State of Massachusetts, have invented a new and .usefulExhaust-Air Conduit for Driers, of

which the following is Va specification.l

This invention relates to a drier for fibrous material of the type inwhich the terial is carried through the main casing of the drier on oneor preferably a plurality of aprons so that the material is carried backand forth through it.

The principal objects of the invention are to provide a more efficientconduit for taking out the air from the drier and especially to improvethe construction of the conduit so that the air will not be robbed fromthe circulating fans and so that the slot through which the air isintroduced into the exhaust `conduit can be adjusted to accommodatevariations in draft and moisture; and also to provide yielding means forregulating the width of the slot and a construction whereby the stockwill vnot be sucked into the conduit.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the, accompanying drawings, in whichj f Fig. 1is a vertical sectional'view through the drier andl conduit showingdetails of construction of the latter;

Fig. 2 is a longitudinal sectional view of the two ends of one wall ofthe drier conduit on the inclined line 2 2 of Fig. 1;

Fig. 3 is a side elevation; and

Fig. 4c is a plan of the same.

We have shown the invention as applied to a well known type ofthree-apron drier in which the wool, cotton or other fibrous material istaken back and forth through the drying chamber 10 on three endlessaprons 11, 12 and 13, one overlthe other. These aprons are of materialof such a nature that the air can pass through them on the way to theexhaust fan 14 at the end of the top of the drier. It is drawn in at thebottom through a chamber 9 provided'with heating coils, not shown. It isto be understood, however, that the invention is not limited to anyparticular number of aprons or to any kind and that the Vsheet metal.

.16 to the projection 19.

aprons themselves do not'constitute a part of this invention. F or that'reason they are not described in detail. v

In order to draw the air out from the top of the vdrier all along the'same and provide for the advantages above mentioned, we connect theintake of the exhaust fan 14, which is located at one end of the drier,with another conduit 15 located along the top of the casing 10. Thisconduit is formed mainly by two walls 16 and 17 of The sheet steel wallon one side, that is, the side 16, is longer than the other so as not torob the circulating fans of air. These two walls are both inclined sothat the cross-section of the conduit is triangular, preferably arighttriangle.

The wall `16, as stated, extends beyond'v the wall 17 and is spaced fromit at the bottom. It is provided with a foot piece 18 extendingthroughout its length nearly parallel with the wall 17 and extending upto a point at about thelower end thereof and spaced from it. AThe bottomof the wall 17 has a right angle projection 19 extending towardl thefoot piece 18 but spaced fromit, leaving an inlet slot 2O between them.j This slot it will be seen receives air from above and cannot receiveit directly from below. This forces the air upwardly from the stockthroughout the length of it and then downwardly into this slot 20. Thisslot vis also tapered from end to end, the smaller end being nearest theexhaust fan so that where the draft is strongest the slot 20 will be thenarrowest.

The whole conduit also tapers in a similar manner, as will be seen fromthe side view. In order to adjust'the slot 20,' we provide a series ofadjusting bolts 21 extending from the projection 19 through the bottomof the wall 16, each one with a thumb nut 22 on the lower end andsprings 23 are provided to yieldingly resist the approach of the wallTherefore when these nuts are tightened up at all the two walls are heldapart yieldingly but firmly and it is a very easy matter to adjust themfarther apart or nearer together. In the operation of the device the airis drawn in through the chamber 9 to the bottom of the drier` andcirculates upwardly throughout its length through all the three aprons.It goes upwardly also fromY the layer of stock on theV top apron andthen downwardly into the slot 2O throughoutv the length ot the drier.Vl`hen it is drawn along the triangular conduit l5 into the exhaust tani4 through a) connection Qd extending into its intake. This insures theciroulation of air throughout the length oit the drier and itsWithdrawal from all parts ot' the upper layer ol;x fibrous material onthe top again. lt permits of the adjustment ol the intake slot 2O to anydesired degree and avoids the taking ot Vtoo much air from thecirculating fans 28 so that it will all have to pass through thematerial to be dried.

Although We have illustrated and described the invention as applied to aparticular type ot drier tor librous nhterials and shown in detail thoconstruction orn the apparatus as prelerablj,7 in; le, we are aware ofthe tact that the invention can be applied to other makes oit driers andthat modifications can be rnade by any person slzllled in the artWithout departing 'troni the scope ot the invention as exi sed in theclaims. vlhere-are ive do not irish to lee limited to all the details otconstruction he "ein shown and described or to the particular torni oldrier illustrated but what vie do claim is:

l. ln a drier for brous materials, the conihination with a casing havinga plurality ot endless apron conveyors; therein tor the steelt andlocated one over the other, and an efihaust tan for drawing the airthrough the several apro-ns and out et the drier, ot a conduit ot'triangular shape extending dong in the top et said casing over the topapron, said conduit having slot thereinncar the bottom but openingupwardly 'lroni it.

Q. ln a drier Ytor dbrous materials, the 'comn hination with a casingand an endless apron therein` for conveying he material to be drie-dthrough the easing, of an exhaust 'lian for drawing the air over thematerial and out of the easing, a longitudinal conduit in the top ot'said easing connected with the tan and having a slot near the bottonitor receiving the air from the 'material on the apron, and means 'toradjusting the slot to control the current.

3. ln a drier for librous materials, the combination with a casing andan endless apron therein 'for conveying the material to be driedthrough.` the easing, of 'an exhaust fan 'for drawing-the air overthematerial and out of the casing, a longitudinal conduit in the top ofsaid easing connected with the tan and having a slot near the/*bottomtor receiving the air from the material on the apron, a series of boltsfor connecting the Walls of the ,conduit on opposite sides oli saidslot, nuts on s aid bolts for drawing the Walls or" lthe conduit'towvardeach other and narrowing the intake slot, and springs on the bolts forholding' the Walls ot the conduit apart yieldingly.

4f.. The combinationwith a driercasing and an exhaust tan, ot atriangular conduit the top of the 'casing extending throughout thelength thereof, the bottorn or" one wall ot said conduit extendingbeyond the lower edgeotl the other and projecting upwardly at itsextreme end to provide a. slot throughout the length ot' the'conduitopening downwardly into the conduity `'or the entrance ot air from thestoel; throughout the length of the easing.

5. The combination with a drier casing and an exhaust fan, ot a`triangular conduit in the top of the easingfextending throughout thelength thereof, one Wall of said eenduit extending heyond the lower endot the other at the bottonrand projecting uprfarr at .its extreme endbeyond theI other Wall to provide a slot throughout the length ot theconduit opening downwardly into the Vconduit 'tor the ventrance-of airfrom the stoel; throughout the length -ot the easing, said slot taperingtroinend to end. p

6. A conduit' for drierconiprising a wall extending substantiallythroughout the length of thedri-er at an inclination, aseoond Wall ofthe sarneext'e'nt inclined inthe opposite direetionto' makethe `Conduittriangular in shape, theseoond Wall extending below and beyondthe vlowerVendo't the first f.

Wall and spaced therefrom, said conduit tapering from one end to` theother, the slot between the. two Walls the bottom'also heing taperedinthe same direction.

ln testimony whereof We have hereunto atlixed our signatures.

FRANK L. FURBUS ALLAN C. SARGENT.

